Sunglasses for snow, and the 5% figure that decides them

Why snow needs a darker lens than anywhere else

Fresh snow is close to the most reflective surface you will ever stand on. The light that would normally be absorbed by ground comes back up at you instead - so you are lit twice, from above and below, and the underside of a lens is doing work it never does in summer.

Altitude compounds it. Thinner atmosphere absorbs less ultraviolet, so a bright day at a resort base is already harsher than the same day at sea level, and a day above the treeline is harsher again. The consequence is not sunburn on your eyelids - it is photokeratitis, the condition people call snow blindness, which arrives hours after the exposure that caused it and is the reason this page cares about published UV figures rather than tint fashion.

Which leads to the one number worth shopping on: VLT, visible light transmission, the percentage of light the lens lets through. A lower number is a darker lens. Our VLT and lens-color guide covers it properly for goggles; sunglasses use the same figure, and on snow you want it low.

The 0-4 category scale, and the honest caveat on driving

You will see lenses described by a filter category from 0 to 4. That scale comes from the European sunglasses standard rather than from US regulation, and it is a band rather than an exact figure. The commonly published ranges:

Category 4 is where snow sits, and category 4 is widely labeled as unsuitable for driving. Be precise about what that means: the labeling requirement belongs to the European standard, not to US law, and the US uses a different standard entirely. But the practical point survives the jurisdiction question - a lens passing 5% of the light is genuinely too dark to drive in, in any country, and that is the single most useful thing to know before you buy one.

When sunglasses are right, and when they are not

This matters more than which pair you buy, and it is the question our goggles-against-sunglasses comparison exists to answer. The short version:

• Sunglasses are the right choice for cross-country skiing. You are working hard, generating heat and moving at modest speed - goggles fog and overheat, sunglasses vent. Cross-country, and whether it is the cheaper winter sport.
• Right for snowshoeing and winter hiking, for the same reason - uphill effort, low speed, no wind chill from descending. Snowshoes, sized on published load.
• Right for spring resort days, slushy afternoons and sitting outside at lunch - what else changes for spring.
• Wrong for a lift-served downhill day. No seal against wind at speed, nothing to stop spindrift, no impact rating, and nothing that works with a helmet brim - that is a goggle purchase.
• Wrong for children, as the only eyewear. Our position on the comparison page is that children are not a judgment call: a child on snow needs goggles that stay on and seal - kids’ goggles, and the two specs that matter.
• The practical answer for most people is both, which is cheaper than it sounds because the sunglasses do a second job all summer.

What this page ranks on

• 1. Published VLT percentage. The entry requirement. A lens with no published VLT cannot be compared with one that has it, which is exactly why the cheapest frame here carries the skip rather than the win.
• 2. Published UV protection. Blocking UVA, UVB and UVC, stated by the maker. Note that tint darkness and UV protection are independent - a very dark lens with poor UV filtering is worse than a light one with good filtering, because the dark tint opens your pupil and then lets ultraviolet through it.
• 3. Side shields, and whether they come off. The light on snow comes from below and from the sides. A shield blocks it; a shield you cannot remove makes the glasses unwearable anywhere else.
• 4. Published weight and dimensions. Weight for a long day, and lens width, bridge and temple length because fit is the one thing a specification can tell you about eyewear you cannot try on.
• 5. Photochromic range, where published. One lens covering several categories is worth real money if the alternative is two pairs.
• Not tint color, not style, not brand heritage. And not optical clarity, which nobody publishes in a comparable form.

The three, compared

Read the first row and the last together. The two lenses with a published VLT figure cost $84.95 and $229.95; the one with no published figure costs $79.95. You are not paying a large premium for the information here - the cheapest Julbo is five dollars more than the Tifosi and tells you exactly what it does.

The picks

Julbo Camino, Spectron 4 lens

The pick, and the cheapest lens on this page dark enough for the job. Julbo publishes the Spectron 4 option at 5% VLT - 95% of visible light blocked - with 100% of UVA, UVB and UVC filtered, a polycarbonate lens, removable side shields described as soft, lightweight and easily removable, and a published weight of 25 g. Full dimensions are published too: a 58 mm by 43 mm lens, 15 mm bridge, 135 mm temples, base 6. MSRP $84.95.

The removable shields are the detail that makes this a sensible single purchase rather than a specialist one. Clipped in, you have most of the coverage of a glacier glass - the light coming off the snow from below and from the side is the half that ordinary sunglasses ignore completely. Taken out, it is a normal pair of dark sport sunglasses you will wear in July. Very few things in this ledger do two seasons’ work.

Worth knowing: Julbo publishes two other lens options on the same frame - a Spectron 3 at 13% VLT and a polarized Spectron 3 at 12%. If your use is mostly spring resort days rather than high sun on open snow, those are the better choice and the frame is identical. The Amazon listing we link is specifically the Spectron 4.

Honest cons. At 5% VLT this is too dark to drive in, and too dark for flat light or a late-afternoon return through trees - a category 4 lens is a single-condition tool. No anti-fog treatment is published, and sunglasses fog on a climb just as goggles do. No warranty term is published. And it is not a goggle: no seal, no wind protection, no impact rating.

Julbo Shield, REACTIV 2-4 Polarized lens

The one pair that can cover a whole day. Julbo publishes the REACTIV 2-4 Polarized lens as photochromic, shifting from 20% VLT when cloudy to 5% VLT in extreme sunlight - category 2 through 4 in one lens - and as polarized, with 100% UVA, UVB and UVC blocked, removable synthetic side shields, and a published 32 g weight. Julbo lists it as ideal for mountaineering, hiking and high glare. MSRP $229.95.

What you are buying is the solution to the Camino’s one real flaw. A fixed 5% lens is perfect for two hours and wrong for the rest of the day; a lens that sits at 20% in the trees and 5% in the open covers the actual arc of a winter day. The polarization is a separate benefit and a real one on snow - reflected glare off wet spring snow and ice is polarized light, so a polarized lens removes it rather than merely dimming everything. Polarized against photochromic, and which is worth it is the page on that trade for goggles, and the same physics applies here.

Honest cons. $229.95 published is roughly three times the Camino for one feature. Photochromic lenses react to ultraviolet rather than to brightness, which has a specific consequence worth planning for: a car windshield filters UV, so the lens stays at its lighter end behind glass - convenient here, but it means you cannot rely on it darkening in a bright car. 32 g against the Camino’s 25 g is noticeable over a long day. No anti-fog treatment published, and no warranty term published for this lens option. And it is still not a goggle.

Tifosi Moab, three-lens interchange set, and why it carries the skip

Three interchangeable lenses in one frame for a published $79.95, which is the cheapest frame here and the only one that lets you change tint rather than buy a second pair. For mixed light across mixed sports that is genuinely good value.

It carries the skip for one reason, and it is not price or build. Tifosi publishes no lens category and no VLT percentage for any of the three lenses on its own product page - nor a UV figure, a weight, or any dimensions. On a page whose single ranking criterion is the published light-transmission figure, a product that publishes none cannot hold the top spot, however good it may be. That is an absence of published information rather than a verdict on the hardware, and it is the same call this site has made before on helmet audio and helmet covers.

Honest cons, beyond the missing figures: no side shields, so it does nothing about the light reflecting up off the snow, which on this page is half the problem. No warranty term published for this model, only a link to a general warranty page. And a three-lens set tempts you to carry spare lenses you will not actually swap on a cold day with gloves on.

Buying eyewear you cannot try on

Two of these three publish full dimensions, which is unusually generous and worth using.

• Measure a pair you already own. Lens width, bridge and temple length are printed inside the temple arm of most sunglasses, usually as three numbers like 58-15-135. Compare those against the published figures rather than guessing from a photograph.
• Wider lenses matter more on snow than elsewhere. The light is coming from below and the side, so coverage at the edge of the lens is doing real work - a narrow fashion lens leaves a bright gap at your cheekbone.
• Check them against your helmet if you will wear both. Temple arms and a helmet’s ear pads compete for the same space, which is the same interface problem goggles and helmets have.
• If you wear prescription glasses, this page is the wrong aisle. A prescription insert or an over-the-glasses frame is the answer - ski eyewear that fits over glasses, and the three other options.
• Keep a retainer cord on them. Both Julbo frames are published with temples shaped for a cord. Sunglasses pushed onto a hat come off a chairlift; a dollar of cord prevents it.

Looking after a snow lens

• Never wipe a dry lens. Snow and grit on a dry lens is sandpaper. Rinse or breathe on it first, then use a soft cloth - the same rule as cleaning goggles without ruining the lens.
• Nothing on the inside of a coated lens. Mirror and hydrophobic coatings sit on the surface and come off with solvents, paper towel and sunscreen.
• Sunscreen is the quiet enemy. It transfers from your face to the lens and then to the coating - apply it before you pick the eyewear up.
• Hard case for a pair with removable shields. Shields bend and the hinge is the failure point.
• Do not leave them on a car dashboard. Heat warps frames and lifts coatings, which is also where the end-of-season storage rule applies - put eyewear away clean and in a case.